Oct. xS, 1915 
Automatic Transpiration Scale 
127 
record on account of the double offset, but is difficult to determine in a 
record of the ordinary type. 
Protecting case.—A tight weatherproof case inclosing the column 
and beam of the balance protects the automatic equipment from the 
Fig. 13.—Dashpot for preventing the oscillation of the beam during 
, windy weather. 
weather. The case is equipped with a removable top and a sliding front. 
The latter is also supplied with a smaller door through which the appa¬ 
ratus can be observed and adjusted. 
Fig. 14— Spring motor, showing the cam K for raising the beam, and 
the fan F for regulating the speed. 
Electric circuits. —The electrical connections consist of three cir¬ 
cuits (fig. 17). A single dry cell, operates the relay through the beam 
contact. The ball valve and the motor release are connected in parallel 
in a second circuit, B 2 , containing a battery of three or four cells. This 
